How vital is sleep? and any tips on organizing my priorities?

Hi, im extremely curious how unhealthy my sleeping habits have become. I just finished my freshmen year in college, now 19 years old, average/athletic body type/size. average eating habits (healthy but snack) I worked extremely hard this year and it did pay off but this led me to develop bad sleeping habits... i tended to get and average of 4 hours of sleep a night and towards the end of the year I was averaging approx 1 all-nighter a week and at one point I was up for 62 hours straight (nearly 3 days). Its not like im wasting time all night, i accomplished a lot of school work and it was often productive. These habits have now carried over to the summer. I am getting a little more sleep, approx. an average of maybe 6-7ish a night with occasional all-nighters... i know you're probably saying okay why now? but i work approx 30 hours a week at my part time job (soon to be 50 hours/week) then also a great deal of yard work, work on my car, love to spend time with my family/girlfriend, clean A LOT (i have a slight case of OCD and love everything to always be clean and nearly perfectly organized) I lose sleep because i want to accomplish so much over the next 2 months that i have off but feel like i don't have the time... I do organize what i want to get done and categorize and prioritize... ive got all of that down pat to my own style, but its that the lists are so long and i run out of time. I feel fine during the day and with the amount of sleep that i get, it doesnt usually effect my day's but im just worried about future health issues and how fast/severe these issues could happen? (heart attack,stroke, etc...) Please any help/feedback would be great... but please, i understand that fundamentally sleep is very important but if anyone could break it down in detail that would be very much appreciated. Thank you in advanced